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Bryan Schumakerce4ef7c2012-07-16 16:39:15 -04001/*
2 * linux/fs/nfs/file.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 */
Anna Schumakerf4ac1672014-11-25 13:18:15 -05006#include <linux/fs.h>
Peng Taobea51b32015-09-26 02:24:36 +08007#include <linux/file.h>
Anna Schumakerf4ac1672014-11-25 13:18:15 -05008#include <linux/falloc.h>
Bryan Schumakerce4ef7c2012-07-16 16:39:15 -04009#include <linux/nfs_fs.h>
Christoph Hellwig0f42a6a2015-11-13 09:38:48 +010010#include <uapi/linux/btrfs.h> /* BTRFS_IOC_CLONE/BTRFS_IOC_CLONE_RANGE */
Trond Myklebust5445b1f2015-09-05 19:06:58 -040011#include "delegation.h"
Bryan Schumakerce4ef7c2012-07-16 16:39:15 -040012#include "internal.h"
Trond Myklebust5445b1f2015-09-05 19:06:58 -040013#include "iostat.h"
David Howellsa4ff1462012-12-05 16:31:49 +000014#include "fscache.h"
Bryan Schumakerce4ef7c2012-07-16 16:39:15 -040015#include "pnfs.h"
16
Trond Myklebust81b79af2015-03-25 19:09:08 -040017#include "nfstrace.h"
18
Anna Schumaker1c6dcbe2014-09-26 13:58:48 -040019#ifdef CONFIG_NFS_V4_2
20#include "nfs42.h"
21#endif
22
Bryan Schumakerce4ef7c2012-07-16 16:39:15 -040023#define NFSDBG_FACILITY NFSDBG_FILE
24
25static int
26nfs4_file_open(struct inode *inode, struct file *filp)
27{
28 struct nfs_open_context *ctx;
Miklos Szeredibe62a1a2016-03-26 16:14:39 -040029 struct dentry *dentry = file_dentry(filp);
Bryan Schumakerce4ef7c2012-07-16 16:39:15 -040030 struct dentry *parent = NULL;
31 struct inode *dir;
32 unsigned openflags = filp->f_flags;
33 struct iattr attr;
34 int err;
35
Bryan Schumakerce4ef7c2012-07-16 16:39:15 -040036 /*
37 * If no cached dentry exists or if it's negative, NFSv4 handled the
38 * opens in ->lookup() or ->create().
39 *
40 * We only get this far for a cached positive dentry. We skipped
41 * revalidation, so handle it here by dropping the dentry and returning
42 * -EOPENSTALE. The VFS will retry the lookup/create/open.
43 */
44
Al Viro6de14722013-09-16 10:53:17 -040045 dprintk("NFS: open file(%pd2)\n", dentry);
Bryan Schumakerce4ef7c2012-07-16 16:39:15 -040046
Benjamin Coddington18a60082015-06-25 09:25:50 -040047 err = nfs_check_flags(openflags);
48 if (err)
49 return err;
50
Bryan Schumakerce4ef7c2012-07-16 16:39:15 -040051 if ((openflags & O_ACCMODE) == 3)
52 openflags--;
53
54 /* We can't create new files here */
55 openflags &= ~(O_CREAT|O_EXCL);
56
57 parent = dget_parent(dentry);
David Howells2b0143b2015-03-17 22:25:59 +000058 dir = d_inode(parent);
Bryan Schumakerce4ef7c2012-07-16 16:39:15 -040059
NeilBrown532d4de2016-10-13 15:26:47 +110060 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
Bryan Schumakerce4ef7c2012-07-16 16:39:15 -040061 err = PTR_ERR(ctx);
62 if (IS_ERR(ctx))
63 goto out;
64
65 attr.ia_valid = ATTR_OPEN;
66 if (openflags & O_TRUNC) {
67 attr.ia_valid |= ATTR_SIZE;
68 attr.ia_size = 0;
Trond Myklebust8b7d9d02016-07-14 12:42:40 -040069 filemap_write_and_wait(inode->i_mapping);
Bryan Schumakerce4ef7c2012-07-16 16:39:15 -040070 }
71
Kinglong Meec5c3fb52015-08-26 21:11:39 +080072 inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, &attr, NULL);
Bryan Schumakerce4ef7c2012-07-16 16:39:15 -040073 if (IS_ERR(inode)) {
74 err = PTR_ERR(inode);
75 switch (err) {
76 case -EPERM:
77 case -EACCES:
78 case -EDQUOT:
79 case -ENOSPC:
80 case -EROFS:
81 goto out_put_ctx;
82 default:
83 goto out_drop;
84 }
85 }
David Howells2b0143b2015-03-17 22:25:59 +000086 if (inode != d_inode(dentry))
Bryan Schumakerce4ef7c2012-07-16 16:39:15 -040087 goto out_drop;
88
89 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
90 nfs_file_set_open_context(filp, ctx);
David Howellsf1fe29b2013-09-27 11:20:03 +010091 nfs_fscache_open_file(inode, filp);
Bryan Schumakerce4ef7c2012-07-16 16:39:15 -040092 err = 0;
93
94out_put_ctx:
95 put_nfs_open_context(ctx);
96out:
97 dput(parent);
98 return err;
99
100out_drop:
101 d_drop(dentry);
102 err = -EOPENSTALE;
103 goto out_put_ctx;
104}
105
Trond Myklebust5445b1f2015-09-05 19:06:58 -0400106/*
107 * Flush all dirty pages, and check for write errors.
108 */
109static int
110nfs4_file_flush(struct file *file, fl_owner_t id)
111{
112 struct inode *inode = file_inode(file);
113
114 dprintk("NFS: flush(%pD2)\n", file);
115
116 nfs_inc_stats(inode, NFSIOS_VFSFLUSH);
117 if ((file->f_mode & FMODE_WRITE) == 0)
118 return 0;
119
120 /*
121 * If we're holding a write delegation, then check if we're required
122 * to flush the i/o on close. If not, then just start the i/o now.
123 */
124 if (!nfs4_delegation_flush_on_close(inode))
125 return filemap_fdatawrite(file->f_mapping);
126
127 /* Flush writes to the server and return any errors */
128 return vfs_fsync(file, 0);
129}
130
Anna Schumaker1c6dcbe2014-09-26 13:58:48 -0400131#ifdef CONFIG_NFS_V4_2
Anna Schumaker2e724482013-05-21 16:53:03 -0400132static ssize_t nfs4_copy_file_range(struct file *file_in, loff_t pos_in,
133 struct file *file_out, loff_t pos_out,
134 size_t count, unsigned int flags)
135{
Trond Myklebust837bb1d2016-06-25 18:12:03 -0400136 if (file_inode(file_in) == file_inode(file_out))
Anna Schumaker2e724482013-05-21 16:53:03 -0400137 return -EINVAL;
138
Anna Schumaker2e724482013-05-21 16:53:03 -0400139 return nfs42_proc_copy(file_in, pos_in, file_out, pos_out, count);
140}
141
Anna Schumaker1c6dcbe2014-09-26 13:58:48 -0400142static loff_t nfs4_file_llseek(struct file *filep, loff_t offset, int whence)
143{
144 loff_t ret;
145
146 switch (whence) {
147 case SEEK_HOLE:
148 case SEEK_DATA:
149 ret = nfs42_proc_llseek(filep, offset, whence);
150 if (ret != -ENOTSUPP)
151 return ret;
152 default:
153 return nfs_file_llseek(filep, offset, whence);
154 }
155}
Anna Schumakerf4ac1672014-11-25 13:18:15 -0500156
157static long nfs42_fallocate(struct file *filep, int mode, loff_t offset, loff_t len)
158{
159 struct inode *inode = file_inode(filep);
160 long ret;
161
162 if (!S_ISREG(inode->i_mode))
163 return -EOPNOTSUPP;
164
Anna Schumaker624bd5b2014-11-25 13:18:16 -0500165 if ((mode != 0) && (mode != (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE)))
Anna Schumakerf4ac1672014-11-25 13:18:15 -0500166 return -EOPNOTSUPP;
167
168 ret = inode_newsize_ok(inode, offset + len);
169 if (ret < 0)
170 return ret;
171
Anna Schumaker624bd5b2014-11-25 13:18:16 -0500172 if (mode & FALLOC_FL_PUNCH_HOLE)
Anna Schumakerf830f7d2015-03-16 14:06:24 -0400173 return nfs42_proc_deallocate(filep, offset, len);
174 return nfs42_proc_allocate(filep, offset, len);
Anna Schumakerf4ac1672014-11-25 13:18:15 -0500175}
Peng Taobea51b32015-09-26 02:24:36 +0800176
Christoph Hellwig04b38d62015-12-03 12:59:50 +0100177static int nfs42_clone_file_range(struct file *src_file, loff_t src_off,
178 struct file *dst_file, loff_t dst_off, u64 count)
Peng Taobea51b32015-09-26 02:24:36 +0800179{
180 struct inode *dst_inode = file_inode(dst_file);
Peng Tao811b7b82015-09-26 02:24:38 +0800181 struct nfs_server *server = NFS_SERVER(dst_inode);
Christoph Hellwig04b38d62015-12-03 12:59:50 +0100182 struct inode *src_inode = file_inode(src_file);
Peng Tao811b7b82015-09-26 02:24:38 +0800183 unsigned int bs = server->clone_blksize;
Christoph Hellwig21fad3132015-11-13 09:38:47 +0100184 bool same_inode = false;
Peng Taobea51b32015-09-26 02:24:36 +0800185 int ret;
186
Peng Tao811b7b82015-09-26 02:24:38 +0800187 /* check alignment w.r.t. clone_blksize */
188 ret = -EINVAL;
189 if (bs) {
190 if (!IS_ALIGNED(src_off, bs) || !IS_ALIGNED(dst_off, bs))
Christoph Hellwig04b38d62015-12-03 12:59:50 +0100191 goto out;
Peng Tao811b7b82015-09-26 02:24:38 +0800192 if (!IS_ALIGNED(count, bs) && i_size_read(src_inode) != (src_off + count))
Christoph Hellwig04b38d62015-12-03 12:59:50 +0100193 goto out;
Peng Tao811b7b82015-09-26 02:24:38 +0800194 }
195
Christoph Hellwig04b38d62015-12-03 12:59:50 +0100196 if (src_inode == dst_inode)
197 same_inode = true;
Christoph Hellwig21fad3132015-11-13 09:38:47 +0100198
Peng Taobea51b32015-09-26 02:24:36 +0800199 /* XXX: do we lock at all? what if server needs CB_RECALL_LAYOUT? */
Christoph Hellwig21fad3132015-11-13 09:38:47 +0100200 if (same_inode) {
Al Viro59551022016-01-22 15:40:57 -0500201 inode_lock(src_inode);
Christoph Hellwig21fad3132015-11-13 09:38:47 +0100202 } else if (dst_inode < src_inode) {
Al Viro59551022016-01-22 15:40:57 -0500203 inode_lock_nested(dst_inode, I_MUTEX_PARENT);
204 inode_lock_nested(src_inode, I_MUTEX_CHILD);
Peng Taobea51b32015-09-26 02:24:36 +0800205 } else {
Al Viro59551022016-01-22 15:40:57 -0500206 inode_lock_nested(src_inode, I_MUTEX_PARENT);
207 inode_lock_nested(dst_inode, I_MUTEX_CHILD);
Peng Taobea51b32015-09-26 02:24:36 +0800208 }
209
210 /* flush all pending writes on both src and dst so that server
211 * has the latest data */
212 ret = nfs_sync_inode(src_inode);
213 if (ret)
214 goto out_unlock;
215 ret = nfs_sync_inode(dst_inode);
216 if (ret)
217 goto out_unlock;
218
Christoph Hellwig04b38d62015-12-03 12:59:50 +0100219 ret = nfs42_proc_clone(src_file, dst_file, src_off, dst_off, count);
Peng Taobea51b32015-09-26 02:24:36 +0800220
221 /* truncate inode page cache of the dst range so that future reads can fetch
222 * new data from server */
223 if (!ret)
224 truncate_inode_pages_range(&dst_inode->i_data, dst_off, dst_off + count - 1);
225
226out_unlock:
Christoph Hellwig21fad3132015-11-13 09:38:47 +0100227 if (same_inode) {
Al Viro59551022016-01-22 15:40:57 -0500228 inode_unlock(src_inode);
Christoph Hellwig21fad3132015-11-13 09:38:47 +0100229 } else if (dst_inode < src_inode) {
Al Viro59551022016-01-22 15:40:57 -0500230 inode_unlock(src_inode);
231 inode_unlock(dst_inode);
Peng Taobea51b32015-09-26 02:24:36 +0800232 } else {
Al Viro59551022016-01-22 15:40:57 -0500233 inode_unlock(dst_inode);
234 inode_unlock(src_inode);
Peng Taobea51b32015-09-26 02:24:36 +0800235 }
Christoph Hellwig04b38d62015-12-03 12:59:50 +0100236out:
Peng Taobea51b32015-09-26 02:24:36 +0800237 return ret;
238}
Christoph Hellwig6b7153d2015-11-13 09:38:49 +0100239#endif /* CONFIG_NFS_V4_2 */
Peng Taobea51b32015-09-26 02:24:36 +0800240
Bryan Schumakerce4ef7c2012-07-16 16:39:15 -0400241const struct file_operations nfs4_file_operations = {
Al Viro3aa2d192014-04-02 20:14:12 -0400242 .read_iter = nfs_file_read,
Al Viroedaf4362014-04-03 14:07:25 -0400243 .write_iter = nfs_file_write,
Bryan Schumakerce4ef7c2012-07-16 16:39:15 -0400244 .mmap = nfs_file_mmap,
245 .open = nfs4_file_open,
Trond Myklebust5445b1f2015-09-05 19:06:58 -0400246 .flush = nfs4_file_flush,
Bryan Schumakerce4ef7c2012-07-16 16:39:15 -0400247 .release = nfs_file_release,
Christoph Hellwig4ff79bc2016-03-02 17:35:54 +0100248 .fsync = nfs_file_fsync,
Bryan Schumakerce4ef7c2012-07-16 16:39:15 -0400249 .lock = nfs_lock,
250 .flock = nfs_flock,
Al Viro82c156f2016-09-22 23:35:42 -0400251 .splice_read = generic_file_splice_read,
Al Viro4da54c22014-04-05 04:37:17 -0400252 .splice_write = iter_file_splice_write,
Bryan Schumakerce4ef7c2012-07-16 16:39:15 -0400253 .check_flags = nfs_check_flags,
Jeff Layton1c994a02014-08-27 06:49:41 -0400254 .setlease = simple_nosetlease,
Christoph Hellwig6b7153d2015-11-13 09:38:49 +0100255#ifdef CONFIG_NFS_V4_2
Anna Schumaker2e724482013-05-21 16:53:03 -0400256 .copy_file_range = nfs4_copy_file_range,
Christoph Hellwig6b7153d2015-11-13 09:38:49 +0100257 .llseek = nfs4_file_llseek,
258 .fallocate = nfs42_fallocate,
Christoph Hellwig04b38d62015-12-03 12:59:50 +0100259 .clone_file_range = nfs42_clone_file_range,
Christoph Hellwig6b7153d2015-11-13 09:38:49 +0100260#else
261 .llseek = nfs_file_llseek,
262#endif
Bryan Schumakerce4ef7c2012-07-16 16:39:15 -0400263};